﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Routing;

namespace Exercise1
{
    // Note: For instructions on enabling IIS6 or IIS7 classic mode, 
    // visit http://go.microsoft.com/?LinkId=9394801

    public class MvcApplication : System.Web.HttpApplication
    {
        public static void RegisterRoutes(RouteCollection routes)
        {
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

            routes.MapRoute(
                "BlogArchive",
                "archive/{year}/{month}/{day}",
                new
                {
                    controller = "Home",
                    action = "Index",
                    year = "2008",
                    month = "10",
                    day = "05"
                },
                new
                {
                    year = @"\d{4}",
                    month = @"\d{2}",
                    day = @"\d{2}",
                    date = new DateIsValidConstraint()
                }
                );

            routes.MapRoute(
                "Default",                                              // Route name
                "{controller}/{action}/{id}",                           // URL with parameters
                new { controller = "Home", action = "Index", id = "" }  // Parameter defaults
            );
        }

        protected void Application_Start()
        {
            RegisterRoutes(RouteTable.Routes);
        }
    }

    public class DateIsValidConstraint : IRouteConstraint
    {
        public bool Match(HttpContextBase httpContext, Route route,
            string parameterName, RouteValueDictionary values,
            RouteDirection routeDirection)
        {
            try
            {
                DateTime date = new DateTime(
                    Convert.ToInt32(values["year"]),
                    Convert.ToInt32(values["month"]),
                    Convert.ToInt32(values["day"])
                    );
                if (date.CompareTo(DateTime.Now) <= 0)
                    return true;
                else
                    return false;
            }
            catch
            {
                return false;
            }
        }
    }
}